<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			#container{
				margin: auto auto;
				width: 800px;
				height: 800px;
				 border: 1px solid red;
			}
			#box{
				width: 400px;
				height: 400px;
				 border: 1px solid blue;
				 position: relative;
				 left: 50px;
				 top: 3.125rem;
			}
			#box1{
				width: 100px;
				height: 100px;
				 border: 1px solid black;
				 position: absolute;
				 left: 100px;
				 top: 100px;
			}
		</style>
	</head>
	<body>
		<div id="container">
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			<div id="box">
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				<div id="box1">
					
				</div>
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			</div>
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		</div>
	</body>
</html>
